Cementing device for well casings



R. C. BAKER CEMENTING DEVICE FOR WELL CASINGS Filed Jan. 11, 1941 INVENTOR: fez/65w C. BAKE/e,

ATTORNEYS.

arch 16, 1942. I

Patented Mar. 10, 1942 CEMENTING DEVICE FOR WELL CASINGS Reuben C. Baker, Coalinga, Calif., assignor to Baker Oil Tools, Inc.

ration of California Vernon, Calif., a corpo- Application January 11, 1941, Serial No. 374,049

9 Claims.

This invention relates to well devices, and particularly to equipment useful in cementing casings and liners in oil and similar wells.

casing string, controlling the ejection of cement laterally through the casing into the annular space intervening between it and the walls of the well bore. In its general aspects, the invention contemplates a casing member having lateral ports normally closed by a rubber or other elastic sleeve. This sleeve is confined within an annular chamber, and inherently tends to contract so as to fill the entire volume of this chamber and snugly embrace the casing section through'which' the ports extend; thus positively preventing passage of fluid through these ports in one direction. plication of pressure to the fluid causes it to elongate the rubber sleeve and force the latter away from the ports to allow fluid passage or ejection through the casing section. The release of this pressure allows the sleeve to contract and assume its initial, inherent position in snug embracing engagement with. the casing section to prevent return flow of fluids through its ports.

This invention has. other objects which will become apparent from a consideration of the embodiment shown in the drawing accompanying and forming part of the present specification. This form will now be described in detail, but it is to be understood that such detailed de scription is not to be taken in a limited sense, since the scope of the invention is best defined by the claims appended hereto.

Referring to the drawing:

Figure 1 is a longitudinal sectional view of a cementing device embodying the invention, disclosed as connecting separated casing sections together; and

of the device similarly contains a threaded box l3 for the purpose of receiving the other com- However, the apa material distance on both sides thereof. Ini-.

panion casing section C. The male section l2 has a threaded end l4 receivable within the threaded portion I5 of the female member I0, the two members l0, l2 together forming the main body of a cementing collar or shoe.

The female body membenhas a depending skirt l6 spaced from the outer surface of the male member to define an annular chamber ll open at one end l8. This chamber H receives a rubber or other elastic sleeve l9, one end of which is secured to the female member by the cooperable interlocking flanges 20, 2| provided respectively on the exterior of the rubber sleeve and on the interior of the skirt I6. The sleeve l9 extends from this point of attachment through the entre annular chamber Il, terminating externally thereof in an enlarged end 22 which is free to move outwardly of "the chamber, but is restrained from moving to a material extent inwardly by the engagement of its externally inclined face 23 with a similarly inclined face 24 on the end of the skirt IS.

The rubber sleeve 19 is designed to control passage of fluid through ports 25extending laterally through the male member l2 of the cementing device. For this purpose, it extends around the male member over the ports and for tially, it completely fills the entire annular chamber ll, preventing fluid flow through the ports from the exterior to the interior of the collar or shoe. However, fluid under pressure internally of the cementing device will elongate or stretch the rubber sleeve l9 and producean increase in its internal diameter, forming an annular space with the exterior of the male section I2 through which a stream of fluid can discharge after having exited from the ports. Release of pressure internally of the cementing device A will allow the rubber sleeve l9 to' contract to its initial shape, in which it completely fills the annular chamber, and snugly and tightly embraces the exterior of the male section to prevent return fiow of fluid back through the ports 25.

The sealingactlon of the rubber sleeve I9 is increased by the cooperation between the inclined face 23 of its enlarged terminus 22 and the inclined face 24 on the skirt Hi. It will be noted that these faces are inclined inwardly away from the open end l8 of the chamber I1,

so that a contraction of the rubber sleeve will cause its inclined face 23 to move the enlarged free end 22 radially inwardly into firmer sealin engagement with the exterior of the male member l2. Fluid pressures externally of the device serve to increase this sealing action due to the ccoperability of the inclined faces 23, 24.

This sealing action is further improved-by tapering the end 26 of the enlarged portion to form In effect, this inserting operation causes the rubber sleeve I9 to be stretched over the male member, the slight disparity between their respective internal and external diameters insuring a snug sealing engagement between the two and increasing the effective action of the sleeve in preventing reverse fiow of fluids back into the casing. Such differences in diameter, however, do not prevent elongation of the rubber sleeve 'outwardly of the chamber II'under the action of pressure to allow-fluid discharge from the casing.

I claim:

l. A well cementing apparatus, including a ported tubular member adapted to comprise part of a casing string, a member surrounding the ported area of said tubular member and spaced therefrom to form an annular chamber, and an elastic sleeve substantially entirely filling said chamber to prevent-fluid passage through the ports, but adapted to be elongated by-fluid under pressure from within said tubular member to allow fiuid passage from the interior to the exterior of the cementing apparatus.

2. A well cementing apparatus, including a ported tubular device adapted to be connected to a casing string and having an annular chamber surrounding its ports, and an elastic member substantially entirely filling said chamber, but adapted to be deformed by fluid under pressure to allow fluid passage through said ports.

3. A well cementing apparatus, including a ported'tubular device adapted to be connected to a casing section and having an annular chamber surrounding its ports open at one end, and an elastic member substantially entirely filling said chamber, but adapted to be elongated in the direction of said open end by fluid pressure to form an annular passage through which fluid may flow from said ports.

4. A well cementing apparatus, including a ported tubular device adapted to be connected to a casing section and having an annular chamber surrounding its ports open at one end, and an elastic member substantially entirely filling said chamber to snugly embrace the ported surface of said tubular device, said elastic memberbeing elongated in the direction of said open end by fluid pressure from within said tubular member to form an annular passage through which fluid may fiow from said ports.

5. A well cementing apparatus, including a ported tubular member adapted to be connected to a casing section, a member surrounding the ported portion of said. tubular member and spaced therefrom to form an annular chamber open at one end, and an elastic sleeve secured to one of said members and extending through said chamber toward the open end thereof to substantially ventirely fill said chamber' and snugly embrace the ported surface of said tubular member, said sleeve being elongated in the direction of said open end by fluid pressure from 6. A well cementing apparatus, including operable tubular members adapted to form part of a casing string, one of said'members havingv lateral ports extending therethrough and the other memberbeing provided with a-skirt surrounding said ports in spaced relation thereto to form an annular chamber open at one end, and an elastic sleeve secured to one of said members and extending through said chamber toward the open end thereof to, inherently tend to completely subtend the cross-sectional area of said chamber and snugly embrace the ported tubular member, said sleeve being elongated in the direction of said open end by fluid pressure from within said tubular member to form an annular passage through which fluid may fiowfrom said ports. a

'7. A well cementing apparatus, including cooperable, tubular members adapted to form part of a casing string, one of said members having lateral ports extending therethrough and the other member being-provided with a skirt surrounding said ports in spaced relation thereto to form an annular chamber open at one end, and an elastic sleeve secured to one of said members and extending through said chamber towardthe open end thereof to inherently tend to completely subtend the cross-sectional area of said chamber and snugly embrace the ported tubular member, said sleeve having an enlarged terminal portion externally of said chamber cooperable with the end of said skirt to force the sleeve into engagement with the ported tubular member.

8. A well cementing apparatus, including a ported tubular device adapted to form part of a casing string and having a skirt surrounding its ports in spaced relation thereto to form an annular chamber open at one end, and a rubber sleeve secured to said device and extending through said. chamber toward the open end thereof to inherently tend to completely subtend 5 the cross-sectional area of said chamber and snugly embrace the ported surface of said tubular device, said sleeve having an enlarged terminal portion externally of said chamber, said portion having a face inclined inwardly away from the open end of the chamber cooperable with a companion face on the end of said skirt to force the sleeve radially into engagement with the ported tubular device.

, 9. A well cementing apparatus, including a ported tubular device adapted to form part of a casing string and having a skirt surrounding its ports in spaced relation thereto to form an annular chamber open at one end, and a rubber sleeve secured to said device and extending 60 through said chamber toward the open end thereof to inherently tend to completely fill said chamber and snugly embrace the ported surface of said tubular device, said sleeve having an enlarged terminal portion externally of said chamber provided with a face inclined inwardly 5 away from the open end of the chamber and cooperable with a companion face on the end of said skirt to force the sleeve into engagement with the ported tubular device, said sleeve hav- 70 ing a lesser unrestrained internal diameter than the external diameter of the ported surface of said tubular device.

REUBEN C. BAKER. 

